To celebrate its 25th anniversary, Radio Woodstock put on a little one-day festival, Mountain Jam, at Hunter Mountain. From humble beginnings, great things grow. For its 35th anniversary, the radio station is holding another all-day concert—Speed of Sound Festival at Dutchess County Airport in Wappingers Falls. The event’s music programming complements WDST’s roots-rock playlist. The Avett Brothers headline, with supporting performances from Chris Robinson Brotherhood, Hot Tuna (Electric), Amy Helm & The Handsome Strangers, Connor Kennedy & Minstrel (who brought the house down at the Chronogram Block Party), and Elijah Wolf. Two stages will feature with continuous music from noon till midnight. A portion of the net proceeds will go towards Radio Woodstock’s continuing Pink October fundraising efforts benefiting breast cancer research at the Dyson Center for Cancer Care at Vassar Brothers Medical Center. Speedofsoundfestival.com.